perf: reduce redundant fetches and improve list render efficiency

- Remove no-op per-row task from RepositoryListView; loadMoreIfNeeded
  is a stub for repos so each row was allocating a Task that did nothing
- Fix BuildListView auto-refresh stopping permanently after navigating
  away; startAutoRefresh now runs unconditionally on task so it restarts
  on every reappear, not just first load
- Add lastRefreshed tracking to HomeViewModel with a needsRefresh(after:)
  helper; HomeView and WorkView scene-activation handlers now skip
  loadDashboard() if the data is less than 60 seconds old
- Add 120-second TTL to repository build status refresh; statuses are
  no longer re-fetched on every tab appear, only when stale or when the
  user explicitly pulls to refresh (forceRefresh: true)

Implements: https://todo.sr.ht/~ccleberg/hutch/56

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